Washington earthquakes

M1.5 earthquake 3 km ENE of Oso, Washington

A magnitude 1.5 earthquake struck 3 km ENE of Oso, Washington on Sat, Apr 21, 2001, 8:49 AM PDT (15:49 UTC), 13 km (8 mi) below the surface.

A larger quake followed: M2.2 2 km N of Enetai, Washington. This one was a foreshock.

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Map

Where this earthquake was located, with the others nearby. Select one for its page.

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The earthquake

Magnitude
1.5 (Md, duration), micro
Magnitude from
Pacific Northwest Seismic Network
Local time
UTC
2001-04-21 15:49:42 UTC
Depth
13.3 km (8.3 mi), shallow
Epicenter
48.280° N, 121.884° W
Tsunami flag
No
Status
Reviewed by a seismologist

Did you feel it?

No one has reported feeling this quake to the USGS.

How well it is located

Reviewed by a seismologist.

Location uncertainty
About 0.4 km horizontally, 0.7 km in depth
Magnitude uncertainty
±0.04
Depth from
From location
Station coverage gap
115°
Stations used
7

Nearest places

Distance and direction from each place to the epicenter, with its forecast.

Nearby

Within 100 km, magnitude 1.5 and up: 19 in the 60 days after this one and 11 in the 30 days before it.

After

  1. 1.93 km S of Carnation, Washington · 9294 days ago · 25 km deep · 74 km away
  2. 1.810 km WSW of Skykomish, Washington · 9292 days ago · 9 km deep · 73 km away
  3. 1.68 km ENE of Duvall, Washington · 9283 days ago · 7 km deep · 57 km away
  4. 1.56 km WNW of Bangor Trident Base, Washington · 9283 days ago · 18 km deep · 90 km away
  5. 1.630 km NNW of Leavenworth, Washington · 9282 days ago · -1 km deep · 91 km away
  6. 1.61 km S of Mercer Island, Washington · 9282 days ago · 7 km deep · 84 km away
  7. 1.63 km NE of Granite Falls, Washington · 9281 days ago · -1 km deep · 19 km away
  8. 1.63 km SE of Darrington, Washington · 9281 days ago · 7 km deep · 24 km away
  9. 1.64 km NW of Fall City, Washington · 9280 days ago · 20 km deep · 76 km away
  10. 2.02 km SE of North Stanwood, Washington · 9271 days ago · 17 km deep · 33 km away
  11. 2.11 km SW of Redmond, Washington · 9267 days ago · 7 km deep · 71 km away
  12. 1.65 km SW of Darrington, Washington · 9254 days ago · 11 km deep · 17 km away
  13. 1.94 km SSW of Hansville, Washington · 9251 days ago · 19 km deep · 68 km away
  14. 1.55 km WSW of Coupeville, Washington · 9248 days ago · 27 km deep · 65 km away
  15. 1.76 km W of Camano, Washington · 9247 days ago · 22 km deep · 56 km away
  16. 1.86 km NE of Riverside, Washington · 9246 days ago · 14 km deep · 14 km away
  17. 2.22 km N of Enetai, Washington · 9238 days ago · 23 km deep · 92 km away
  18. 1.61 km W of Lake Marcel-Stillwater, Washington · 9235 days ago · 25 km deep · 66 km away
  19. 1.77 km ENE of Fall City, Washington · 9235 days ago · 4 km deep · 76 km away

Before

  1. 1.60 km WSW of Woodway, Washington · 9296 days ago · 26 km deep · 66 km away
  2. 1.65 km ENE of Anacortes, Washington · 9298 days ago · 15 km deep · 55 km away
  3. 2.23 km SSE of Ames Lake, Washington · 9302 days ago · 11 km deep · 76 km away
  4. 1.63 km S of Ames Lake, Washington · 9302 days ago · 13 km deep · 76 km away
  5. 1.72 km W of North Bend, Washington · 9310 days ago · 19 km deep · 87 km away
  6. 1.66 km NE of Snoqualmie, Washington · 9310 days ago · 10 km deep · 80 km away
  7. 1.53 km SE of Lake Roesiger, Washington · 9311 days ago · 18 km deep · 35 km away
  8. 1.71 km NW of Maple Valley, Washington · 9311 days ago · 12 km deep · 99 km away
  9. 1.55 km N of Woods Creek, Washington · 9315 days ago · 16 km deep · 39 km away
  10. 1.92 km SSE of Lake Roesiger, Washington · 9315 days ago · 11 km deep · 35 km away
  11. 1.5Puget Sound region, Washington · 9322 days ago · 21 km deep · 68 km away

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Sources

From the USGS Earthquake Hazards Program and its partner networks, event uw10530558. Read Fri, Oct 2, 2026, 4:12 AM UTC.